Coordinated electric head and column clamp



Feb. 26, 1935. p. c. KLAUSMEYER ET AL 1,992,311

CQORDINATED ELECTRIC HEAD AND COLUMN CLAMP Filed July 18, 193 1 3Sheets-Sheet 1 avwentou DAVID c. K LAtggggfggR 61 BY H.HENRY SUN ER P'IANN C AUEUSTUS MSOSA 1935- D. c. KLAUSMEYER Er AL 1,992,311

COORDINATED ELECTRIQ HEAD AND COLUMN CLAMP Filed July 18. 1931 3Sheets-Sheet 2 l )4 ;2 l7 7 J 129.5

avweutou DAVID C- KLA MEY ECEASE WWW/ 1W D. c. KLAUSMEYER ET AL1,992,311

COORDINATED ELECTRIC HEAD AND COLUMN CLAMP Feb; 26, 1935.

Filed July 18, 1931 3 Sheets-Shed 3 fillll llllllll-J lllL -IIJ.

I Submtou DA VID C. KLAU5ME YER BY H.HENRY SUN M 4- vc casso DERMANN:xzovron AUGUSTUS M. 505A 7 M2 d y Aka k2 Patented Feb. 26, i935 PATENToFncE COORDINATE!) ELECTRIC HEAD AND CLAMP COLUMH David C. Klausmeyer,deceased, late of.Clncinnati, Ohio, by H. Henry S cm executor,

cinnati, Ohio, and Augustus M. Sosa, Cincinnati, Ohio,

asaignors to The Cincinnati Bicki'ord Tool Company, Cincinnati, Ohio, a

' corporation of Ohio Application July 18, 1931, Serial No. 551,613

0 Claims. (Cl. "-19 This invention relates to drilling machine tools ofthe radial arm type, and more particularly to the clamping mechanismsthereoi that are employed to lock the translatable or, movable membersof the machine organization against movement during the drilling ortooling operation.

A prime object of this invention is to provide individually andindependently operated power means for clamping and unclamping theseveral relatively movable members, particularly the saddle and thecolumn members of a radial drill, whereby each may be independentlyoperated to eiiect clamping or unclamping of the respective movablemember; and as a further refinement, to provide a coordinated controlmeans carried by one of the movable members and located withinconvenient reach of the operator, adapted to govern the individual andsimultaneous operation of the several independent clamping mechanisms.

A further object is to eliminate manually actuable clamping mechanismsand to provide power operated means that will exert a clamping forceadequate for the purpose, and which will exert a force constant in valueat all times thereby reducing the wear and damage to the parts caused byirregular, and often unduly excessive forces exerted .thereon by theoperator when actuating the manual clamping means hereto- .foreemployed. And in addition thereto, to so design the control means forth'e power operated devices as to particularly safeguard .against injuryto the-clamping means and actuators, as well as to save operating time,wherein the mechanisms operate only while the control members aremanually actuated, and are automatically rendered inoperative the momentthe operator removes his hand from the controlling devices. 7 a

The conventional radial drilling machine combines a base member uponwhich is mounted a rotatable column that supportsa radially disposedvertically translatable arm member. '-A tool head or saddle, in which isjournaled the conventional rotatable and translatable drill spindle, ismounted upon the arm and adapted for translation therealong. To insureaccuracy while drilling, the head and column must be rigidly secured totheir supporting members, and it is obviously expedient, in theinterests of savingboth operating time and labor, to provide meanswhereby the clamping and unclamping of both the head and'column may bequickly and eflectively accomplished by power, simultaneously as. wellas individually, from apoint remote from the clamping m and convenientto the operator's normal working position. -Heretofore no adequatemechanism has been devised to save time andlabor in'this manner, and tosafeguard against careless or improper operation.

To overcome these disadvantages, this invention provides electricallyoperated clamping mechanisms and control means including'selfopeningswitch members adapted to control the circuits nmning to the head andcolumn clamping motors in such a manner that the operator mayindependently make or break the circuits to the several motors, or hemay operate the several clamping means simultaneously thereby insuringthat all the members be rigidly clamped prior to the starting of thetooling operation. I

The head clamping mechanism is carried upon the saddle, and includes areversible electric motor, the shaft of-which has a threaded connectionwith a slidable clamping bar that isconstructed in a manner permitting aportion thereof to be drawn into engagement with one of the guideways ofthe radial arm thereby to impinge the head member to the'arn'a' Thecolumn clamping mechanism is likewise operated by a reversible electricmotor, and the circuit therefor is also opened and closed by a controlmember located on the saddle, while a tertiary controlling switchcoordinating the circuits of both clamp motors enables both clamps to beoperated simultaneously. This last mentioned control switch is likewisemounted upon the translatable head member within convenient reach of theoperator, thus there,is provided a plurality of'controls for selectivelyor collectively operating the various clamping mechanisms from thenormal working position.

Each of the clamping motors isof the'type designed to withstand thepassage of current for several minutes after becomingjstalled so thateven though the control switch "on r for a limited time, no damage willbe done to the mechanism. However, a further safety feature is in theprovision for automatically breaking the electric circuit the instantthe operator removes his hand from the control. This automatic featureis of special advantage'not only as a time-saver in eliminating a secondmovement otherwise n to-stop the motor, but also to exact theoperator's'attentlon whenever the motor is working, the better to insureagainst improper operation.

Other objects and advantages will be i part To enable others skilled inthe art so fully to apprehend the underlying features hereof that theymay embody the same in the various ways contemplated by this invention,drawings depicting a preferred typical construction have been annexed asa part of this disclosure and, in such drawings, like characters ofreference denote corresponding parts throughout all the views, ofwhich:-

Figure 1 is a side elevation of a radial drill embodying the presentinvention. Fig. 2 is an enlarged elevation of the head clampingmechanism, partly in section, taken along the line 2--2 of Fig. 1. Fig.3 in a fragmentary side view of the lower portion of the column, showingparts of the column clamping mechanism. Fig. 4 is a section along theline 44 of Fig. 3. Fig. 5 is a sectional plan view, along the line 5-5of Fig. 1. Fig. 6 is a diagrammatic view of the coordinated electricalcircuits and control switches therefor.

Referring to the drawings, Fig. 1 depicts a radial drilling machineembodying the present invention, combining a base 1,- supporting anupright post 2 upon which is rotatably mounted a sleeve 3. A radial arm4 is translatably mounted upon the sieeve and is provided with suitableguideways 5 and 6 adapted to carry a translatable saddle 7 which in turncarries a vertically adjustable and rotatable tool spindle 8. Power forrotating the tool spindle is taken from an electric motor 9 carried by aprojecting portion 10 of the radial arm, and is transmitted throughsuitable gearing and shafting, indicated generally as a, to the toolhead '7 and the spindle feed and speed change gears journaled therein.Power is also taken from the arm shaft for raising and lowering the armand also to translate the head in reverse directions along the arm. Amanually operable hand wheel b is also provided for adjusting the headmanually. However, inasmuch as these mechanisms are conventional devicesand are well known, detailed description and illustration thereof hasbeen thought unnecessary.

Referring to Fig. 2, the principal head clamping member comprises a bar13, slidably mounted within the tool head housing 14, and provided witha notched or reduced portion 13 adapted to receive a downwardlyextendingvportion 15 of the lower guideway 5. The clamping is eifectedby drawing the bar forward until a wall 16 of the bar is brought intoengagement with the rear face of the guideway 5. Further movement of thebar forward draws the rear face of the head tightly against the frontface of the guide and thus clamps the head to the arm.

The actuating medium for the draw-bolt 13 comprises a reversible motor1'7 secured to the drill head 7, the armature shaft 18 of which. haskeyed thereto an internally threaded sleeve member 19. To permit freerotary movement of the sleeve member relative to the housing or head 7,two roller bearings 20 and 21 are provided, one on either side of acentrally disposed flange 23 formed on the sleeve. A suitable lock nut22, threaded into the recess 22, presses against the outer hearing 20and holds all of the parts securely in place. Cooperating with thethreaded sleeve member is the threadedforward end of the notched bar 13,and as the motor 1'? is operated in a forward direction, the bar isdrawn firmly in engagement with the guideway 5 and the head becomesclamped to the arm. It will be noted, that clamping is effected at thatvarea that has a tendency to pull away from the arm during toolingoperation and by locating the clamping means in that vicinity,onlyone'clamping member need beemployed to produce an effected andaccurate locking mechanism. When the motor is operated in the reversedirection, the draw-bolt caused to recede, thus freeing the head fromthe lower guide and permitting easy adjustment of the head either byII'IBJIIJBJ. means orpower means.

the breaking point of any portion of the clamping mechanism that themotor is intended to operate.

Referring to Figs. 1 and 6, a control switch 24,

preferably of the spring push-button type, is provided for controllingthe operation of the clamping motor 17, push-buttons 25 and 26respectively being wired as to open and close the several circuits. Toeffect clamping of the head to the arm, the operator presses'the forwardbutton 25; and so long as the button is depressed, the head clampingmotor is connected with the power lines 55 and 56. Overloading or aburning out "of the motor is guarded against, however, firstly, becausethe motor is initially constructed to withstand a stalling of severalminutes duration without damage, and secondly, switches are springpressed and the moment the operator releases the switch the circuit tothe motor is again disconnected.

- The clamping or unclamping of the members is effected almostinstantaneously the moment the contact is made, the motor turning/only afew revolutions, and under ordinary operating conditions the controlbutton is pressed for relatively short intervals of time. However, iffor any reason the operator holds the circuit closed, he must keep thebutton depressed for a considerably longer period and inasmuch as threeor four minutes is a relatively long interval of time for an operator tohold a push-button switch closed it will' usually be found that thelongevity of the motor exceeds the patience of the operator and theswitch will be released long before any overheating or damaging effectsto the motor occurs. Thus is avoided possible injury to the mechanism byreason of the operator neglecting to turn off the power after theclamping operation is completed.

In like manner, to unclamp the mechanism the reversing button 26 isdepressed and the motor rotates the sleeve 19 in the opposite directionuntil the shoulder 29, formed on the screw shaft 13, engages the extremeend of the cavity 22 formed in the drill head. The stop 29 thus suspendsfurther unwinding of the clamp screw and the motor again comes to restwhen the members are fully unclamped.

In setting up the machine for new work-pieces it is customary to swingthe arm and head angularly about the post 2 in order to provide ampleroom over the work platform or base for the placing of new' work-pieces.After the work is securely fastened thereon the arm is again swung intoposition and the head translated therealong until the drill point isdirectly over the required since the control the sleeve member 3 isenlarged as at 31 and slotted axially and circumierentially as at 32providing two wing portions 33 and 34 adaptedto be flexed tightly intoengagement with the periphery of the central post 2. To accomplish theflexing movement a draw-bolt 35 is provided, the

forward end oi. which issplined to receive an' axially adjustable,externally threaded sleeve member 35 upon which is mounted a manuallyactuable nut 36. A look nut 40, threaded to the end portion 01' thedraw-bolt, holds the sleeve 35- in a preselected axial position so thata given movement, of the draw-bolt eflects clamping of the sleeve to thepost, the opposite end of the draw-bolt being secured to the other wingportion 33 of the sleeve in a manner presently to'be described A lever39,integral with the nut '36 provides the means for manually shiftingthe draw-bolt to effect clamping or unclamping of the column sleevewhenever desired. Additional bolts 41*, mounted in bores in the flanges38 and threaded into the flange 37, prevent too great expansion of thebell shaped portion 31 and carry the greater portion of the load whenthe clamping mechanism is released.

This invention proposes means for efl'ecting axial movement of thedraw-bolt by power controllable from the operator's work station and forthis purpose the opposite end-of the draw-bolt 35 is provided with aring member 42 which encircles a cam or eccentric portion 43 of anoscillatable shaft 44 journaled in bearings formed in the sleeve 31'.The power to rotate the shaft 44 to clamp and unclamp the column, isprovided by a reversible motor 45 mounted upon the column cap 46, (seeFig. 5) and which is adapted to rotate a vertical shaft 47 suitablycoupled to the cam shaft 44.

g The rotor shaft 48 of the motor 45 actuates a. worm gear shaft 49journaled within hearings in a bracket 50 secured to the cap and whichtransmits motion to the vertical shaft 47 through the worm 51 and gearsegment 52. Suitabl'eabutments 53 and 54 are provided integral with thebracket housing 46 to limit the rotation of the gear segment and therebyprevent the shaft 47 from rotating too far in either direction after thecolumn is completely clamped or unclamped. The motor 45, beingreversible and similar in construction to the head clamp motor '17previously described, is controlled fromthe operators normal workingposition in a manner similar to that described for the head clampingmotor. a A description will now be given of the coordinated electriccircuits to control the, passage of current to the head and columnclamping motors to effect individual and/or simultaneous operationthereof. 1

In the diagrammatic Fig. 6, the mechanism indicated generally as Arepresents the circuit for operating the head clamping members,'whilethe mechanism 13 indicates the column clamping circuit. It will beunderstood that the several mechanisms therein shown are intended torepresent conventional electrical instruments and detailed descriptionof the instruments per sehas been thought unnecessary. The current isobtained through the power or lead-in lines55 and 56 and directed to themotors by means of the five pole switch elements 57, 58,59 and 60. Thelatter are actuated by solenoids 61, 62, 63 and 64 respectively, toconnect the circuits, and by conventional resilient means such assprings (not shown) to break them. The solenoids 61 and 62 controllingthe head clamping motor switches are connected to the power lines 55 and56 and become energized upon the manual selective actuation or, thespring push-buttons 25 or 26: while similar buttons and 66 of thecontrol switch 6'7 are provided for energizing the solenoids 63 and 64or the column clamping mechanism.

When push-button 25 is depressed, two circuits .61, and the other, themotor circuit which is closed or completed by the solenoid actuated flvepole switch 57 located in the head clamping motor control box 90, andthe motor is caused to be operated. As soon as the push-button 25 isreleased the circuit t the solenoid is broken and the latter becomes de-energized, after which the switch 57 snaps over to its open positionand the rotation of the motor ceases. In a similar manner, the pressingof the push-button 26 causes the reversing switch solenoid 62 to becomeenergized thereby to close the switch 58 and cause the motor 17 andclamping mechanism associated therewith to operate in the reversedirection.

The column clamping motor is controlled in the same manner, the pressingof push-button 65 eflects a forward or clamping movement of the motor45, and pressing of the button 66 effects the reverse or unclampingmovement of the motor. The current to the various switches and motors isconducted through the column and then by way of flexible cables 72 tothe movable members in a well known manner.

By way of further refinement, this invention proposes means foractuating both of the above explained motors simultaneously in eitherdirection thereby to clamp or unclamp the head and the column at one andthe same time. This improvement contemplates the use of an additionalpush-button control switch 70, each of the buttons 68*and 69 oi. which,when depressed, closes four circuits, two in the head clamping mechanismand two in the column clamping mechanisn'i; the button 68 controllingthe forward or clamping movement of the motors 17 and 45, and button 69controlling'the reverse or unclambing movements of the motors, as shownin the clamping button of the coordinated control switch 70 and the'headand column become immediately clamped in their adjusted positions. Inthi'sway the operator is assured that all of the parts are clamped andthus the possibility of one of the movable members remaining unclampedthe tooling operation with consequent bodily injury'or damage to thetools or workpieces is avoided.

Without further analysis, the foregoing will so fully reveal the gist ofthis invention that others can, by applying current knowledge,

readily adapt it for various utilizations by retain- (ill ing one ormore of the features that, from the standpoint of the prior art, fairlyconstitute essential characteristics of either the generic or specificaspects ofthis invention and, therefore, such adaptations should be, andare intended to be, comprehended within the meaning and range ofequivalency of the following claims:-

Having thus revealed this invention, there is claimed as new and desiredto secure the following combinations and elements, or equivalentsthereof, by Letters Patent of United States:-

1. A drilling machine combining a horizontally disposed arm member;guideways including an upper and lower guideway formed upon said ammember; a tool-head member adjustably mounted upon said guideways; clampmechanism for clamping said head to said arm comprising a draw-boltcarried by one of said members adjacent said lower guideway and thelower left portion of said head member adapted when actuated to clampthe lower left portion of the head member firmly to said lower guideway,and means for actuating said draw-bolt comprising a rotatable, butnon-translatable nut element, an electric motor for actuating said nutselectively in reverse directions thereby to effect clamping or,unclampingaction, and self-opening push-button switch means carried bysaid head member for controlling the action of said motor.

2. A radial drill combining an upright support; a sleeve member movablethereon; a radial arm carried by said sleeve; a tool head slidable onsaid arm; power actuated clamping means electively operable to securesaid sleeve firmly to said support, said means including an electricmotor, and a control circuit therefor having an electro-magnetic switchtherein; power operated clamping means, electively operable to securesaid tool head firmly to said arm, including an electric motor supportedupon said slidable head and a control circuit therefor having anelectro-magnetic switch therein; push button switch means coordinatingthe circuits of said motors and adapted, when actuated, to effectsimultaneous actuation of both of said clamp motors in a predetermineddirection until they become stalled or until said push button means isreleased; and independent and selectively operable means for renderingeach of said motors effective independently of the other, thereby toeffect operation of its related clamping means independently of theother.

3. A radial drill combining anupright support; a sleeve member movablethereon, a radial arm carried by said sleeve; a tool head slidable onsaid arm; power operated clamping means for rigidly securing said sleeveagainst movement relative to said support including a reversibleelectric motor and a control circuit therefor having self-openingreversing switch means therein; power operated clamping means forrigidly securing said tool head against movement on said arm; areversible electric motor and a control circuit therefor havingself-opening reversing switch means therein; independently operablepower devices for actuating the reversing switch means in the controlcircuits of each of said clamp motors; manually operable means forrendering any one of said power devices operative at will thereby tostart operation of its related motor and clamp means; and separate meansfor rendering one of said power devices effective in each of saidcontrol circuits thereby simultaneously to operate the clamping meansfor said tool head and said sleeve until said clamp motors become rocasnstalled or until said separate means is released. '4. In a radial drillhaving an upright support; a column member rotatably mounted thereon; a

radial arm carried by said column and a tool head adjustable along saidarm, the combination of electively operable power operated means forclamping said column to said support comprising a reversible electricmotor and column clamping mechanism adapted to be actuated by saidmotor; a controlling circuit for said motor including a solenoidoperated polarity changing switch means adapted to effect movement ofsaid motor electively in a clamping or unclamping direction andself-opening push button switch means selectively operable to controlthe operation of said polarity changing switch means and thereby theactuation of said column clamping mechanism; clamping means for clampingsaid head to said arm; a second electric motor carried by said head foractuating said head clamping means; a second control circuit for saidsecond motor including a solenoid operated polarity changing switch andself-opening push button switch means therefor selectively operable toactuate said last mentioned polarity switch to a position effectingclamping or unclamping action of said head clamping mechanism, all ofsaid push button switch means being so located as to be operable by anoperator from his position adjacent the drill head in any position ofthe said head along the radial arm;

and means, including an additional set of push button switch means,coordinating the control circuits of both of said clamp motors andadapted when actuated to effect simultaneous operation of both motorselectively in a forward or reverse direction to thereby actuate saidhead and column clamping mechanisms simultaneously.

5. In a radial drill having a support; a. column member rotatablymounted thereon; a radial arm carried by said column and a tool headadjustable on said arm, the combination of power operated means forclamping said column to said support comprising a reversible electricmotor and column clamping mechanism located adjacent the lower end ofsaid column and adapted to be actuated by said motor; a control circuitfor said motor, including a solenoid operated reversing switch meansadapted to effect movement of said motor electively in a clamping orunclamping direction and a set of self-opening push button switch meansselectively operable to control the operation of said reversing switchmeans and thereby the actuation of said column clamping mechanism;clamping means for clamping said head to said arm; a second electricmotor carried by said head for actuating said head clamping means; acontrol circuit for said second motor including a second solenoidoperated reversing switch and a second set of self-opening push buttonswitch means selectively operable to actuate said second reversingswitch to a position effecting clamping or unclamping action of saidhead clamping mechanism,and a third set of push q button switch meanshaving connections with both of said control circuits andadapted whenactuated to effect operation of a reversing switch of each motorwhereupon both motors and their means in each of said circuits adaptedfor selective and independent operation to effect clamping or unclampingaction of the motor driven clamping devices, each of said switches beingadapted, when closed, to complete the circuit to its associated motorand when opened to break a the circuit to its associated motor; andmanually operable self-opening switch means connecting both of saidcontrol circuits in parallel and adapt- 10 ed when closed tocomplete'the circuits to both of said motors simultaneously andwhen'opened to break the circuits to said motors thereby electively toeflect simultaneous clamping or unclamping action of both of saidclamping devices.

H. HENRY SUNDERMANN,

Executor of the Last Will and Testament of David C. Klausmeuer,peceascd.

aooos'rus M. 808A.

